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Fixing SMBus support

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This section of the guide refers to fixing AppleSMBus support in macOS, what is AppleSMBus? Well this mainly handles the System Management Bus, which has many functions like:

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  • AppleSMBusController
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    • Aids with correct temperature, fan, voltage, ICH, etc readings
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  • AppleSMBusPCI
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    • Same idea as AppleSMBusController except for low pandwidth PCI devices
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  • Memory Reporting
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    • Aids in proper memory reporting and can aid in getting better kernel panic details if memory related
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For install purposes, this SSDT isn't needed but for post-install it's recommended to put the final touches on your hack.

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So to get started, we'll want to grab our SMBus SSDT:

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So the important parts we care about are:

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External (_SB_.PCI0, DeviceObj) <- Rename this
+External (_SB_.PCI0.SBUS.BUS0, DeviceObj) <- Rename this
+
+Scope (_SB.PCI0) <- Rename this
+{
+    Device (MCHC)
+    {
+        Name (_ADR, Zero)  // _ADR: Address
+    }
+}
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+Device (_SB.PCI0.SBUS.BUS0) <- Rename this
+
+

To find the correct pathing for your devices, grab Hackintool (Github link) and head to the PCI tab:

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Look for the SMBus device under Subclass, then look beside and you'll see the ACPI path(under IOReg Name). To convert , omit @...

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  • /PC00@0/SMBS@1F,4 -> PC00.SMBS
    • +
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Once finished, it'll look something like this:

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External (_SB_.PC00, DeviceObj) <- Renamed
+External (_SB_.PC00.SMBS.BUS0, DeviceObj) <- Renamed
+
+/* <- Comment out if on Sandy Bridge or newer
+Scope (_SB.PC00) 
+{
+    Device (MCHC)
+    {
+        Name (_ADR, Zero)  // _ADR: Address
+    }
+}
+*/ <- Close the comment 
+
+Device (_SB.PC00.SMBS.BUS0) <- Renamed
+
+

Note: We comment out MCHC on IvyBridge and newer, reason for this is that MCHC is the memory controller for northbridges. Sandy Bridge was the first generation to merge the north and southbridge controllers meaning there's no reason to define this

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Now you're ready to compile the SSDT!

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